1291400682 has 256 divisors, whose sum is σ = 3448811520. Its totient is φ = 316108800.

The previous prime is 1291400681. The next prime is 1291400687. The reversal of 1291400682 is 2860041921.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1291400681) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18188707 + ... + 18188777.

It is an arithmetic number, because the mean of its divisors is an integer number (13471920).

Almost surely, 2^1291400682 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291400682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1724405760).

1291400682 is an abundant number, since it is smaller than the sum of its proper divisors (2157410838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291400682 is a wasteful number, since it uses less digits than its factorization.

1291400682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1291400682 is about 35936.0638078240. The cubic root of 1291400682 is about 1088.9810869446.

The spelling of 1291400682 in words is "one billion, two hundred ninety-one million, four hundred thousand, six hundred eighty-two".